Some of the forms specify that spent convictions need not be declared. If this form doesn't specify this, then declare it, but don't worry as it will be ignored.

OP has asked advice about an application to be submitted on form NTL=no need to declare spent convictions.

Now I could have tried to tell him the whole story that there are some organisation/specific jobs which are exempt from this and even spent convictions need to be declared. They could include, working with children and vulnerable adults, such as elderly and disabled people, senior roles in banking and the financial services industry, certain posts connected to law enforcement, including the judiciary and the police, work involving national security, the navy, the military, the air force, prison service, certain positions in health, pharmacy and the law.

But whats the point of confusing people un-necessarily. He specifically asked if he has to disclose the spent convictions on form NTL (to transfer ILR into new passport). Answer is: No